Water and energy fluxes from a woodland savanna (cerrado) in southeast Brazil

Author(s)

Cabral, Osvaldo M. R. ; da Rocha, Humberto R. ; Gash, John H. ; Freitas, Helber C. ; Ligo, Marcos A. V.

• Document type: Journal article
• Source: JOURNAL OF HYDROLOGY-REGIONAL STUDIES; v. 4, p. 19-pg., 2015-09-01.

Abstract

Study region: The area of woodland savanna (cerrado) is located in southeast Brazil (21 degrees 36' to 44'S, 47 degrees 34' to 41'W). Study focus: The cerrado sensu-stricto savanna evapotranspiration was observed using the eddy-covariance method over three years. New hydrological insights for the region: The first year total rainfall (R = 1664 mm) was 11% above the long-term rainfall (1498 mm) and the total evapotranspiration (ET = 1242 mm) and water equivalent of available energy (A(v) = 1835 mm) were approximately 4% and 2% greater, respectively, than in the second year when the rainfall total was 5% lower than the long-term average. In the third year despite the total rainfall (1259 mm) being 24% lower than the first year and 16% lower than the average, the totals of ET (1242 mm) and A(v) (1815 mm) were approximately the same. The small variation in the observed annual ET totals shows that in this cerrado vegetation the deep soil moisture content supports the ET in a dry year and the water available for recharging the soil profile and groundwater (similar to R - ET) was dominated by the rainfall amount being significantly greater in the wet year (422 mm) than in the dry year (13 mm). (C) 2015 The Authors. Published by Elsevier B.V. (AU)

• FAPESP's process: 08/58120-3 - Carbon tracker and water availability controls of land use and climate changes
• Grantee: Humberto Ribeiro da Rocha
• Support Opportunities: Research Program on Global Climate Change - Thematic Grants